Does Arterial Health Affect V[spacing dot above]O2peak and Muscle Oxygenation in a Sedentary Cohort?.

• Autores: Catherine Anne Lizamore, Michael J. Hamlin, Lee Stoner, Adam Lucero, Samuel J. E. Lucas
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 47, Nº. 2, 2015, págs. 272-279
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • AB Purpose: An association between arterial health and peak oxygen consumption (V[spacing dot above]O2peak) has been demonstrated; however, little is known about how arterial health influences muscular oxygenation during exercise. The aim of this study was to gain insight into the relations between arterial health, V[spacing dot above]O2peak, and muscle oxygenation in a middle-age sedentary population. Methods: Radial augmentation index (AIx) (via pulse wave analysis) of 21 sedentary middle-age participants (15 females and six males; age, 54.7 +/- 5.4; body mass index, 29.0 +/- 4.7 kg[middle dot]m-2; mean +/- SD) was assessed, and on another day ( < 7 d), participants completed a modified Bruce protocol (MBP). Using near-infrared spectroscopy, total oxygenation index (TOI) of the left flexor carpi ulnaris and the left vastus lateralis were monitored throughout the MBP. Independent and average (arm + leg) percentage decrease in TOI between stage 1 of the MBP and maximal exertion (TOIdiff) during MBP was calculated. Changes between dependent variables were correlated using Pearson product-moment correlations and were interpreted as follows: r > 0.5, strong; 0.5 > r > 0.3, moderate; and r < 0.3, weak. Results: We observed moderate negative correlation between AIx and V[spacing dot above]O2peak (r = -0.34, -0.63 to -0.03; Pearson correlation, 90% confidence limits) and strong negative correlation between AIx and average TOIdiff (r = -0.58, -0.78 to -0.27). The V[spacing dot above]O2peak and average TOIdiff were strongly correlated (r = 0.55, 0.23-0.77). Conclusions: Arterial health seems to be an important determinant of muscle oxygenation during exercise. In turn, muscle oxygenation during exercise is strongly related to V[spacing dot above]O2peak. Developing training modalities to prioritize arterial health outcomes may be a useful way of improving V[spacing dot above]O2peak in this population